如何在 Flutter 中将列和行项目居中？

我有一个小货币桌。我没有使用网格。我使用了列和行。问题是行中的项目没有显示在中心，如下面的 Excel 示例所示。 我必须使用什么小部件才能使项目居中？

示例代码：

return new Center(
  child: new Column(
    crossAxisAlignment: CrossAxisAlignment.center,
    children: <Widget>[
      new Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          new Padding(
            padding: const EdgeInsets.fromLTRB(15.0, 5.0, 15.0, 5.0),
            child: new Icon(
              Icons.crop_rotate,
              color: Colors.white,
            ),
          ),
          new Padding(
            padding: const EdgeInsets.fromLTRB(15.0, 5.0, 15.0, 5.0),
            child: new Text("STG", style: mainHeadTextStyle),
          ),
          new Padding(
            padding: const EdgeInsets.fromLTRB(15.0, 5.0, 15.0, 5.0),
            child: new Text("EUR", style: mainHeadTextStyle),
          ),
          new Padding(
            padding: const EdgeInsets.fromLTRB(15.0, 5.0, 15.0, 5.0),
            child: new Text("USD", style: mainHeadTextStyle),
          ),
        ],
      ),
      new Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
....
....
....

如果你想要整个表Centered， 使用mainAxisAlignment的财产Column.

Column

mainAxisAlignment: MainAxisAlignment.center //Center Column contents vertically,
crossAxisAlignment: CrossAxisAlignment.center //Center Column contents horizontally,

Row

mainAxisAlignment: MainAxisAlignment.center //Center Row contents horizontally,
crossAxisAlignment: CrossAxisAlignment.center //Center Row contents vertically,